之后阐述了脉冲宽度调制和脉冲频率调制的工作原理。

Then the principle of Pulse Width Modulation and Pulse Frequency Modulation is analyzed in detail.

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为了获得足够的带宽，雷达采用一种非规则频率调制的波形。

In order to obtain enough bandwidth, HF radars use an irregularly frequency modulated waveform.

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设计了统计直方图数据处理方案，按照正态分布的特性找出了寄生频率调制的标准偏差。

Statistics histogram data processing scheme is designed. Standard deviation of frequency modulation is found out according to normal distribution characteristics.

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